You're welcome. I've got another link that is, I think, more comprehensive and from someone with far more knowledge than I. Aside from Larry being one of my favorite authors, he's an expert (as he details in the essay). I think it might be useful for your father's class and it is likely far better written than anything I could say:

http://larrycorreia.wordpress.com/2012/12/20/an-opinion-on-gun-control/